I recently put Yokohama Y370 LT tires (195/75) on my '84 and they are, in
a word, awesome.  No hyperbole.  Here in Peterborough (Canada) we got a
big snowfall (about 3-4 inches) and these tires don't let go.  The only
downside I can think of is that there is no treadwear warranty, but
someone has already writen in saying that he's been running his yokohamas
for about six years-- not too shabby.

Marcus